The Small Helix-Loop-Helix Protein NsrC is a Regulator of Phycobilisome Biosynthesis
Abstract Nitrogen is a key nutrient that influences primary productivity in both aquatic and terrestrial ecosystems. In cyanobacteria, its deficiency affects growth, phycobiliprotein biosynthesis, and leads to degradation of phycobilisomes (PBSs). While the biosynthesis genes of phycobiliprotein are regulated by strong promoters, the molecular mechanisms underlying their regulation in response…